An aquarium has a length of 20 inches, a width of 10 inches, and a height of 18 inches. the directions tell you to fill the aquarium until you have a 2-inch gap between the top of the water level and the top of the aquarium. what is the volume of the water?

Sara goes on a slingshot ride in an amusement park. she is strapped into a spherical ball that has a radius 3*10^2 of centimeters. what is the volume of air in the spherical ball? use this formula: volume of a sphere=4/3pi,r^3 , where r is the sphere’s radius.